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研究生： Dwi Prasetya
Dwi - Prasetya
論文名稱： Shear Behavior of Reinforced Concrete Columns with High Strength Steel and Concrete under High Axial Load
Shear Behavior of Reinforced Concrete Columns with High Strength Steel and Concrete under High Axial Load
指導教授： 歐昱辰
Yu-Chen Ou
口試委員: 黃世建
Shyh-Jiann Hwang
李宏仁
Hung-Jen Lee
學位類別： 碩士
Master
系所名稱： 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 165
中文關鍵詞： column 、high strength concrete 、high strength steel 、cyclic loading 、axial compressive load 、concrete shear strength
外文關鍵詞： column, high strength concrete, high strength steel, cyclic loading, axial compressive load, concrete shear strength
相關次數： 點閱：292  下載：11 
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    • Eight columns were tested under axial compression load and cyclic loading. All specimens were designed for shear failure using high strength concrete and high strength steel as its reinforcement. The parameters of these columns were compressive strength of concrete (70 MPa and 100 MPa), transverse reinforcement spacing (hoop ratio ??=0.14 %, ??=0.25 %), and axial load ratio (30% - 40% ??′∙??). Eight specimens from previous studies were included to investigate the shear capacities of high-strength concrete columns under axial compression load effect. ACI 08-318 adopt 45o of the critical crack angle in its calculation makes the conservative estimation. AASHTO LRFD 2007 considers the axial load effect to predict the crack angle and perform conservative enough to predict the crack angle. The test results compared with the ultimate shear strength and concrete shear strength predict by several codes. The test results show that the maximum strength of columns appears before the yielding of stirrups. The stress of the transverse reinforcement at maximum lateral strength should be limited. The axial compression stress affect the concrete shear stress in low axial compressive stress and the effect was not clear in high axial compressive stress.

    Eight columns were tested under axial compression load and cyclic loading. All specimens were designed for shear failure using high strength concrete and high strength steel as its reinforcement. The parameters of these columns were compressive strength of concrete (70 MPa and 100 MPa), transverse reinforcement spacing (hoop ratio ??=0.14 %, ??=0.25 %), and axial load ratio (30% - 40% ??′∙??). Eight specimens from previous studies were included to investigate the shear capacities of high-strength concrete columns under axial compression load effect. ACI 08-318 adopt 45o of the critical crack angle in its calculation makes the conservative estimation. AASHTO LRFD 2007 considers the axial load effect to predict the crack angle and perform conservative enough to predict the crack angle. The test results compared with the ultimate shear strength and concrete shear strength predict by several codes. The test results show that the maximum strength of columns appears before the yielding of stirrups. The stress of the transverse reinforcement at maximum lateral strength should be limited. The axial compression stress affect the concrete shear stress in low axial compressive stress and the effect was not clear in high axial compressive stress.

    ABSTRACT ................................ ................................ ................................ .................. i ACKNOWLEDGEMENT ................................ ................................ ........................... ii TABLE OF CONTENTS ................................ ................................ ............................ iii LIST OF TABLES ................................ ................................ ................................ ...... vi TABLE OF FIGURES ................................ ................................ .............................. viii 1. INTRODUCTION ................................ ................................ ............................... 1 1.1 Background ................................ ................................ ................................ .. 1 1.2 Problem Definition ................................ ................................ ...................... 2 1.3 Objective and Scope ................................ ................................ .................... 3 1.4 Organization ................................ ................................ ................................ . 4 2. PREVIOUS RESEARCH AND LITERATURE REVIEW ................................ . 5 2.1 Previous Research ................................ ................................ ........................ 5 2.1.1 N. Sakaguchi, et.al. ................................ ................................ .............. 5 2.1.2 Hiroshi Kuramoto and Koichi Minami ................................ ................ 9 2.1.3 Makoto Maruta ................................ ................................ .................. 12 2.1.4 F. Watanabe and T. Kabeyasawa ................................ ........................ 16 2.2 Literature Review ................................ ................................ ...................... 20 2.2.1 ACI 318M-08 ................................ ................................ ..................... 20 2.2.2 AASHTO LRFD (2007) ................................ ................................ .... 22 2.2.3 Japanese Equation ................................ ................................ .............. 25 3. SPECIMENS DESIGN AND TEST PROGRAM ................................ ............. 31 3.1 Specimen Design ................................ ................................ ....................... 31 3.2 Materials ................................ ................................ ................................ .... 31 iv 3.2.1. Longitudinal Reinforcement ................................ .............................. 32 3.2.1 Transverse Reinforcement ................................ ................................ . 32 3.2.2 Concrete ................................ ................................ ............................. 33 3.3 Construction of Specimens ................................ ................................ ........ 33 3.4 Instrumentations and Measurements of Load, Strain and Displacements . 38 3.5 Test Set Up ................................ ................................ ................................ . 41 3.6 Applied Loading ................................ ................................ ........................ 43 4. TEST RESULTS AND OBSERVATION ................................ ........................... 44 4.1 Test of the Specimens ................................ ................................ ................ 44 4.1.1 Column C Series ................................ ................................ ................ 44 4.1.2 Column D Series ................................ ................................ ................ 55 4.2 Test Result Comparison ................................ ................................ ............. 65 4.3 Cut Through Aggregate................................ ................................ .............. 69 4.4 Buckling of Longitudinal Reinforcement ................................ .................. 70 5. COMPARISON OF TEST RESULTS AND DISCUSSION ............................. 71 5.1 Hysteretic Loop and Envelope ................................ ................................ ... 71 5.2 Critical Crack Angle and Secant Lateral Stiffness ................................ ..... 77 5.3 Maximum Stress of Transversal Reinforcement ................................ ........ 79 5.4 Comparison of Test Result and Shear Prediction ................................ ...... 81 5.5 Concrete Shear Stress due to Axial Compression Stress Effect ................ 84 6. CONCLUSION AND FUTURE WORK................................ ........................... 87 6.1 Conclusion ................................ ................................ ................................ . 87 6.2 Future Work ................................ ................................ ............................... 88 REFERENCES ................................ ................................ ................................ .......... 89 APPENDIX A SPECIMEN DESIGN DRAWING ................................ .................. - 1 - v APPENDIX B FRICTION AND AXIAL FORCE ................................ ................ - 9 - APPENDIX C STRAIN READING ................................ ................................ ...... - 18 - APPENDIX D SHEAR STRAIN AND CURVATURE ................................ ......... - 59 -

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